sub conflict_check { if (($FREQUENCY eq '7') && ($SITE_A_ANTENNA_LENGTH eq '0.3')) { next; } if (($FREQUENCY eq '7') && ($SITE_B_ANTENNA_LENGTH eq '0.3')) { next; } if (($FREQUENCY eq '11') && ($SITE_A_ANTENNA_LENGTH eq '0.3')) { next; } if (($FREQUENCY eq '11') && ($SITE_B_ANTENNA_LENGTH eq '0.3')) { next; } if (($FREQUENCY eq '28') && ($SITE_A_ANTENNA_LENGTH eq '0.8')) { next; } if (($FREQUENCY eq '28') && ($SITE_B_ANTENNA_LENGTH eq '0.8')) { next; } ...and so on...